This really pretty crystal elegant glass Prelude 6 inch high X 5 1/4 inch diameter Swan bowl was made by New Martinsville Glass from 1936 to 1939. The Swan has a Sterling base. The base is signed Sterling - see picture. It is in very good condition with no chips, cracks or scratches. The sterling base does need cleaned, but it is in very good condition. Be sure to search our other New Martinsville glass available. We guarantee items to be as described. THANK YOU.